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kishikawa katsumi My SwiftData Review SwiftDataͷධՁʹؔ͢Δࢲݟ

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What Is SwiftData? SwiftDataͱ͸ʁ • Introduced at WWDC 2023 • Data persistence framework • Works great with SwiftUI

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Tech Event Manager Sample App

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Tech Event Manager Sample App

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Address Book Sample App

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Schema Definition

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Display the Data

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What Is SwiftData? SwiftDataͱ͸ʁ • Introduced at WWDC 2023 • Data persistence framework • Works great with SwiftUI • Core Data wrapper 🔑

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What Is SwiftData? SwiftDataͱ͸ʁ • Introduced at WWDC 2023 • Data persistence framework • Works great with SwiftUI • Core Data wrapper 🔑

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SwiftData Is Just Wrapper of Core Data SwiftData͸Core DataͷϥούʔϥΠϒϥϦͰ͋Δ • Not reworked Core Data • Provides a more user-friendly API for working with Core Data in Swift • Schemas de fi ned in code • No separate mapping fi le (*.xcdatamodeld) • Type safe queries • Eliminate string-based Key Paths

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SwiftData Simplifies the Core Data API Core DataͷAPI͕ΑΓγϯϓϦʹ࢖͍΍͘͢ • NSPersistentContainer => ModelContainer • NSManagedObjectModel => PersistentModel • NSManagedObjectContext => ModelContext • NSPredicate => #Predicate • NSPersistentStoreCoordinator => 🗑 • *.xcdatamodeld => 🗑

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Also brings legacy issues طଘͷ໰୊఺΋ͦͷ··࢒͍ͬͯΔ

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The issue is Core Data ݁ہͷͱ͜Ζɺ૪఺͸Core Data • For those familiar with Core Data, • Core Data is proven, stable, simple and convenient. • For those unfamiliar with Core Data, • Core Data is di ffi cult to control and is a black box
 that causes mysterious errors and crashes.

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Why argue for and against Core Data? ͳͥCore DataͷධՁ͕෼͔ΕΔͷ͔ • CoreData is not relational database • However, many expect Core Data to be SQLite ORM

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Core Data Is Not Relational Database (Nor ORM) Core Data͸Relational DatabaseͰ͸ͳ͍ʢORMͰ΋ͳ͍ʣ • CoreData Is Object Graph Manager

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Misconception that CoreData is not RDB CoreData͸RDBͰ͸ͳ͍ͱ͍͏͜ͱ΁ͷޡղ • Apple just says it for marketing purposes.

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Misconception that CoreData is not RDB CoreData͸RDBͰ͸ͳ͍ͱ͍͏͜ͱ΁ͷޡղ • Apple just says it for marketing purposes.

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Misconception that CoreData is not RDB CoreData͸RDBͰ͸ͳ͍ͱ͍͏͜ͱ΁ͷޡղ • Apple just says it for marketing purposes • Support for data stores other than SQLite (Binary, XML, In-Memory) • SwiftData supports SQLite only. Therefore, it is a wrapper for SQLite.

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Misconception that CoreData is not RDB CoreData͸RDBͰ͸ͳ͍ͱ͍͏͜ͱ΁ͷޡղ • Apple just says it for marketing purposes • Support for data stores other than SQLite (Binary, XML, In-Memory) • SwiftData supports SQLite only. Therefore, it is a wrapper for SQLite.

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Misconception that CoreData is not RDB CoreData͸RDBͰ͸ͳ͍ͱ͍͏͜ͱ΁ͷޡղ • Apple just says it for marketing purposes • Support for data stores other than SQLite (Binary, XML, In-Memory) • SwiftData supports SQLite only. Therefore, it is a wrapper for SQLite. • Completely di ff erent, technically • CoreData is object graph manager • Object graph is groups of objects form a network through their relationships with each other.
 In short, it is a collection of objects.

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For Relational Database Many to Many Relations Event Attendee

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For Relational Database Event Attendee Event-Attendee Many to Many Relations

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For Core Data

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For Core Data

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CoreData Is Not Relational Database CoreData Is Object Graph Manager • Many to Many relationships • No foreign key required

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All Operations Are on Memory

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All Operations Are on Memory

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CoreData Is Not Relational Database All Operations Are on Memory

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CoreData Is Not Relational Database All Operations Are on Memory

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CoreData Is Not Relational Database Batch Update

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CoreData Is Not Relational Database Batch Update

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CoreData Is Not Relational Database Batch Update

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CoreData Is Not Relational Database Batch Update

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CoreData Is Not Relational Database Batch Update

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CoreData Is Not Relational Database Batch Update

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Available Data Types อଘͰ͖ΔϓϩύςΟͷܕ • Primitive Types • Int, Float, Double, String, Bool • URL, UUID • Codable

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Codable Composite Type (Core Data)

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Codable (Composite) Types Are Queryable CodableܕͰอଘͨ͠σʔλΛݕࡧ৚݅ʹͰ͖Δ

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Codable (Composite) Types Are Queryable CodableܕͰอଘͨ͠σʔλΛݕࡧ৚݅ʹͰ͖Δ

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Enums Cannot Be Stored Even If Codable Enum͸CodableͰ͋ͬͯ΋อଘͰ͖ͳ͍

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Available Data Types อଘͰ͖ΔϓϩύςΟͷܕ • Primitive Types • Int, Float, Double, String, Bool • ❌ CGFloat • URL, UUID • Codable • ❌ Enums

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Auto Save Is Enabled, No Way to Detect Errors Auto Save͕༗ޮͳͱ͖ɺอଘࣦഊΛ஌Δ͢΂͕ͳ͍ • Seems to work correctly, but data is lost on exit • Migration failures silently erase existing data

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Compiler Is Silent Despite Unsaved Models อଘͰ͖ͳ͍σʔλϞσϧͰ΋ίϯύΠϧ͕௨Δ

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Compiler silent despite incomplete initialisers ෆ׬શͳΠχγϟϥΠβͰ΋ίϯύΠϧ͕௨Δ (Runtime Error)

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#Predicate Macro Has Many Unsupported Features #PredicateϚΫϩ͸ະαϙʔτͷػೳ͕ଟ͍

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#Predicate Macro Has Many Unsupported Features #PredicateϚΫϩ͸ະαϙʔτͷػೳ͕ଟ͍

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#Predicate Macro Has Many Unsupported Features #PredicateϚΫϩ͸ະαϙʔτͷػೳ͕ଟ͍

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#Predicate Macro Has Many Unsupported Features #PredicateϚΫϩ͸ະαϙʔτͷػೳ͕ଟ͍

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#Predicate Macro Has Many Unsupported Features #PredicateϚΫϩ͸ະαϙʔτͷػೳ͕ଟ͍ • Case Insensitive Search • Su ffi x Search • Date formatting and Compare • Max/Min • Composite Unique Constraint

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Is SwiftData Production Ready? SwiftData͸࣮༻Մೳ͔ʁ • Depends on how familiar you are with Core Data. • No Fine-Grained CoreData Controls • No Faulting • No Parent/Child Context • No Merge Policy • SwiftData Itself Is Also Incomplete

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Conclusion ݁࿦ • SwiftDataͷ࠾༻͸৻ॏΛཁ͢Δ • Core Dataͷܦݧ͕ඞཁ • ORMΛٻΊ͍ͯΔͳΒORMΛ୳ͦ͏ • ແ੍ݶʹϢʔβʔ͕σʔλΛ࡞੒͢ΔΑ͏ͳ༻్ʹ͸޲͔ͳ͍ • ͍ͭͰ΋σʔλΛফͤΔΩϟογϡͳͲͰࢼͦ͏

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